I have a canon 50d with obstructions on the sensor.
I have tried to clean the filter with this kit.
After aggressive wet cleaning, same as above but with multiple passes across the filter and scrubbing one half the filter to see if I could dislodge anything:
Here is a cropped view of the top left corner:
Is there a stronger emulsifier I could use on the filter to try to dislodge the granules or another technique I could use to try and remove them?
I have read online about people removing the low pass filters from their cameras so one option might be to remove the filter altogether. The filter has a dust reduction circuitry so this may be more complicated than just removing it Step 17.